Improvement in mica chimneys for lamps



B. J. C. HOWE.

Mica Lamp Chimney.

Patnted Jan., 27, 1863.

N. PETERS. PMIQLith agriphun Washington. D. c.

UNITED STATES PATENT OFFICE.

BENJAMIN J. O. HOWE, OF SYRACUSE, NEW YORK.

IMPROVEMENTIN MICA CHIMNEYS FOR LAMPS.

Specification forming part of Letters Patent No. 37,506, dated January27, 1863.

To all whom it may concern.-

Be it known that I, BENJAMIN J. O. HOWE, of the city of Syracuse, in thecounty of Onondaga and State of New York, have invented a new and usefulImprovement in Lamp-Chimneys; and I do hereby declare that the same isfully and accurately described and represented in the followingspecification and drawings. Y

The nature of my improvement consists in the application of sheets ofmica supported by a frame consisting of two upright posts held inposition by an oval ring at the base and a round or oval ring at thetop, the object of which is to produce a cheaper and more durablearticle of use and trade.

In the accompanying drawings the same letters indicate like parts ineach of the figures.

Figure 1 is a perspective view of the chimney complete.

Fig. 2is an elevation showing the method of securing the edges of thesheets of mica a a by the brass binding 1) b, thereby securing the thinlayers from separating, and preventing the lodgment of smoke or dustbetween them. 0 is a clasp for joining or splicing.

Fig. 3 shows one of upright posts. d d are the lips for fastening theupper end to the top ring. 0 is a lip or projection for securing thepost to the oval base or ring. A

Fig. 4 shows the clasp for joining the edges of mica where it isnecessary to use two pieces instead of one.

Fig. 5 is an inside view of one of the posts. ff are the grooves whichhold the sides of the sheets of mica in shape and place. 9 g are lipswhich are bent or clasped over the ends of the sheets.

Fig. 6 is an elevation showing the oval ring or base. h h are holesthrough which the lips e e are passed.

In the manufacture of these chimneys I find it best to form the bottomand top rings, the posts, and also to cut the holes and lips forfastening the different parts together by means of steel punches anddies worked in iron presses. When the different parts are fitted, Isecure the upper ends of the posts to the upper ring. The sheets arethen slid into the grooves ff, and made fast by turning over the lips gg at both ends of the posts and pressing them down. The oval bottom ring(Fig. 6) is then put on. The lips or projections 6 e are passed throughthe holes h h, and firmly clinched down, thus securing the wholecomplete.

The advantages of this invention over glass are that it is not broken byheat or cold or by falling, and over other mica chimneys are that, beingoval at the base, it conforms more nearly to the flame, thus bringingthe sides farther from it, and at the' same time the mica is not bentenough to injure the texture.

I believe I have thus shown the nature, construction, and advantages tobe derived from the use of this improvement clearly enough to enable aperson skilled in the art to make the same.

What I claim, therefore, as my own invention, and desire to secure byLetters Patent, is-

The oval base, (Fig. 6,) the construction of the frame as described, andthe transferable sheets of mica a a.

BENJAMIN J. O. HOWE.

Witnesses:

J. B. GAYLORD, E. E. BosTwIoK.

